Single File Upload With PHP

<?php
/*
*      Simple file Upload system with PHP.
*      Created By Tech Stream
*      Original Source at http://techstream.org/Web-Development/PHP/Single-File-Upload-With-PHP
*      This program is free software; you can redistribute it and/or modify
*      it under the terms of the GNU General Public License as published by
*      the Free Software Foundation; either version 2 of the License, or
*      (at your option) any later version.
*
*      This program is distributed in the hope that it will be useful,
*      but WITHOUT ANY WARRANTY; without even the implied warranty of
*      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
*      GNU General Public License for more details.
*
*/
    if(isset($_FILES['image'])){
        $errors= array();
        $file_name = $_FILES['image']['name'];
        $file_size =$_FILES['image']['size'];
        $file_tmp =$_FILES['image']['tmp_name'];
        $file_type=$_FILES['image']['type'];
        $file_ext=strtolower(end(explode('.',$_FILES['image']['name'])));

        $expensions= array("jpeg","jpg","png");
        if(in_array($file_ext,$expensions)=== false){
            $errors[]="extension not allowed, please choose a JPEG or PNG file.";
        }
        if($file_size > 2097152){
        $errors[]='File size must be excately 2 MB';
        }
        if(empty($errors)==true){
            move_uploaded_file($file_tmp,"images/".$file_name);
            echo "Success";
        }else{
            print_r($errors);
        }
    }
?>

<form action="" method="POST" enctype="multipart/form-data">
<input type="file" name="image" />
<input type="submit"/>
</form>